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In 2373, the standard Starfleet uniform was again modified, maintaining the same basic shape and division colors, but reversing the colors on the shoulders and turtleneck. The blue-grey shoulder area was now quilted with vertical stitches. The division colors were also displayed on each wrist as a colored hoop.

A succession of other Starfleetuniforms based upon this modification were also phased into service during this time.

Although the new duty uniform retained the same basic structure and style of the last standard duty uniform, the yoke/shoulder area usually displaying division colors was given a standard, blue-gray color and quilted. Cuffs were also added to the uniform, bearing a stripe of corresponding division color.

While several prominent closures are visible on the First Contact-style uniform, several more "unseen" closures appear to exist in the uniform. Despite its generally sleek, jumpsuit-like appearance, the uniform seems to have the ability to split in two pieces becoming a separate jacket and trousers. This function was demonstrated in several episodes of DS9: "Rocks and Shoals" and "Change of Heart" among them.

With this new wave of duty uniforms, so too came minor variants available to commanding officers. Similar to the so-called "Captain's jacket" variant worn in the 2360s, a new vest or waistcoat was introduced aboard starships and space stations. Bearing the same gray, quilted yoke as the duty uniform (extended lower, below the combadge), this sleeveless, low-necked vest allowed the wearer a more casual appearance. (Star Trek: First Contact; DS9: "Rapture")

While Picard seemed to switch between the standard duty jacket and the vest, Sisko was seen wearing it beneath his uniform, sometimes causing his uniform to seem quite bulky. Minor differences in the construction of the uniform notwithstanding (Picard's featured round openings for the arms, while Sisko's were squared off), the vests appear identical.

Captain Sisko wearing his uniform variant

In addition to the vest, a more formal uniform was also available to commanding officers. Featuring only minor differences from the standard duty uniform, a variant uniform without cuffs and bearing a more formal collar was also in use as early as 2373. (DS9: "Rapture", "The Darkness and the Light")

Sisko's other variant uniform has caused some confusion among fans, though it appeared only twice. The uniform seems to be the same style worn by the captain throughout the rest of the series, simply missing its cuffs and zipped all the way up. It is unclear whether this was intended to be an attempt at a new uniform to set the captain apart, or whether it was simply supposed to be another option, like the vest. Whatever the case, the uniform was either modified or replaced during "The Darkness and the Light" and never reappeared.

First appearing in 2374, Starfleet issued a uniform for flag officers such as admirals reflecting the new duty uniform.

Again retaining the same basic form as the previous style, the next generation of flag officer service uniform incorporated the adjusted color scheme and quilted yoke. The cuffs were wider than present on the standard uniform, displaying admiral's rank insignia. A belt was also introduced to the uniform, with either a plain gold rectangular buckle or an oval buckle displaying the United Federation of Planets logo. (DS9: "Behind the Lines", "Favor the Bold"; Star Trek: Insurrection)

The new style was first seen donned by Admiral Ross in the DS9 episode "Behind the Lines". Just a few episodes before this (in "A Time to Stand"), Ross was seen wearing the previous style uniform indicating that Starfleet didn't introduce this version for at least a year after first adopting the First Contact-style duty uniform. The rectangular belt buckle appeared only in "Behind the Lines"; by the next episode, Ross was wearing the belt with the Federation logo.

The first, used around 2374, closely resembled the preceding style of dress uniform, a standard two-tone long jacket and black trousers. New to this version, which retained the previous coloration of black with one of the three division colors, was the quilted yoke, cuffs with a gold band, and a black belt displaying the seal of the United Federation of Planets. The gold trim along the collar was widened to three parallel gold bands, with the middle band retaining the broken style of the few previous dress uniform styles, while the outer bands were solid. (DS9: "You Are Cordially Invited")

Clearly an alteration of existing dress uniforms, this variant existed only long enough to appear in the wedding of Worf and Dax, even then obscured by dark lighting and the ceremonial Klingon robes worn by O'Brien, Bashir and Sisko. Only Nog appeared in this uniform without the Klingon robes.

In 2375, the second dress uniform variant was introduced, this time a stark departure from previous styles. Throwing out the old color scheme and long jacket, the new style favored a white, short jacket with gold trim and a quilted gray center section, worn over black trousers which were also trimmed in gold.

Division colors were less prominent than in the preceding style, appearing as piping around the collar and wide bands on the cuffs and side seams of the trousers.

While this uniform was standard to all duty officers, captains and flag officers wore white in place of blue-gray in the center section. Flag officers had a wider cuff braid with a solid white line running through it upon which rank insignia was affixed.

Members of the Starfleetband at the Riker-Troi wedding worn a solid gray uniform, which featured a longer, looser jacket than the standard uniform. The gold and division color trim on the standard jacket was replaced with white, and the collar, now distinguished by white trim where it meet the shoulders, sported a thick band of white running the center of it where rank was displayed. The division color strip on the pants was also white. (Star Trek: Insurrection; DS9: "Inter Arma Enim Silent Leges"; Star Trek Nemesis)

Introduced in Insurrection, the new dress uniform appeared only once on Deep Space Nine, but was featured prominently in the Riker/Troi wedding in Nemesis. Despite wearing a special dress uniform baldric throughout TNG, Worf did not wear one over this iteration.

Some fans have suggested that the gray with white trim dress uniforms worn by the band in Star Trek Nemesis were dress uniforms intended for use by noncommissioned or enlisted personnel. The Oboe player was wearing rank insignia, though the his rank wasn't seen clearly.

For harsh or desert conditions, specialized robes were worn to protect against sunlight and provide comfort in hot and humid conditions.

Consisting of off-white-colored robes and hoods, pants and short-sleeve shirts, trimmed with division colors, this particular uniform served when the standard duty uniform may have proved uncomfortable or inappropriate for some environments.

Specialized boots were also part of the desert uniform, also off-white, with treads better suited to mountainous or more rugged terrain. (DS9: "Shadows and Symbols")

Some time around 2372, a corresponding alteration was made to the uniform worn at Starfleet Academy and by Starfleet cadets serving aboard starships.

While essentially the same design as the preceding style – gray jumpsuit with division colored shoulders – quilting was again added to the yoke as were cuffs bearing division colors. Instead of being a one-piece uniform, however, it was split, now sporting a gray mock turtleneck beneath.

As with the earlier style, the uniform was gray (rather than black worn by officers) and featured pockets running down the trousers. (DS9: "Valiant", "Field of Fire")

Oddly, while Nog continued to wear his Academy-style uniform (sans First Contact alterations) until 2374, all evidence indicates the new style existed as early as 2372 – the year the Valiant left Earth carrying a group of cadets, and the same year Hector Ilario graduated from the Academy, seen wearing this version in a photograph.

In use since the mid-22nd century, the distinct, black uniforms worn by operatives involved with Starfleet's secret organization Section 31 remained basically unchanged in the 2370s. Made from a black, leather-like material, the Section 31 uniform consisted of a long, black coat worn over a black mock turtleneck tunic and black trousers. (DS9: "Inquisition")

As Section 31 mastermind Sloan has been seen throughout DS9 wearing various, more recognizably Starfleet uniforms, its possible that this uniform is some kind of covert or black-ops uniform, or simply civilian clothing.

It is unclear why audiences never saw Dr. Crusher in her blue lab coat following the uniform change in First Contact, but Dr. Lewis Zimmerman's use of his wrinkled, off-white lab coat in his season five appearance on Deep Space Nine seems to indicate that the practice continued and was at least informally accepted by uniform regulations.

Though these uniforms were not seen in canon until 2373, the final issue of the IDW Comics miniseries Star Trek: Spock: Reflections shows Picard wearing this uniform in 2372, after Spock has taken Kirk's body from Veridian III and re-interred it at the Kirk family farm in Iowa.